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t in (-oo:+oo)
(1/5)*(15-(10*t)) = t // - t
(1/5)*(15-(10*t))-t = 0
(1/5)*(15-10*t)-t = 0
1/5*(15-10*t)-t = 0
1/5*(15-10*t)-t = 0
3-3*t = 0
3-3*t = 0
3-3*t = 0 // - 3
-3*t = -3 // : -3
t = -3/(-3)
t = 1
t = 1
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